Covertec for Wood Substrate

Specifications

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How to choose Screws and bolts

Points to check when selecting, with the values for this product (Covertec for Wood Substrate).

1. 1. Select a type that suits the substrate

   Drill screws are used for steel substrates, S-cut tip or double-thread screws for wood substrates, and dedicated lift-prevention tip products for existing slate or shingle roofs. Each substrate type has a different structure. Confirm the existing roof construction and substrate material before selecting.

2. 2. Check the drillable sheet thickness for steel substrates

   Drill screws have an upper limit on drillable steel sheet thickness. Listed products have an upper limit of 3.2 to 4.5 mm and a lower limit of 1.6 mm. Confirm that the thickness of the substrate steel, such as purlins, falls within this range, and also check tip specifications such as pilot length of 12 mm and cutting blade outer diameter of 3.4 mm.

3. 3. Length suited to the total thickness of stacked materials

   Re-roofing construction passes through the new roofing, existing roofing, insulation and other layers, so confirm the maximum clamping thickness. The maximum clamping thickness of the listed product is 30 mm. Some are available in series lengths such as 90 to 150 mm. Select a length that allows sufficient engagement into the substrate beyond the total thickness.

4. 4. Check nominal diameter and pitch

   This product: Nominal diameter d 6.3 mm

   Listed products have a nominal diameter of 4.5 to 6.3 mm and a pitch of 1.8 to 2 mm. A larger diameter gives greater holding power but also affects the hole diameter in the substrate and roofing. Also confirm the manufacturer's specified size and compatibility with the bits and drivers used for installation.

5. 5. Compare pull-out and shear strengths

   Roofs receive uplift forces from wind suction. Listed products show values of 5.9 kN in steel substrates, 2.5 kN in wood substrates, up to 600 N in structural plywood substrates, and maximum shear of 1200 N. Use the values for each substrate in calculating the required design strength and the number of fasteners.

6. 6. Washer material and outer diameter for waterproofing

   This product: Washer Outer Diameter 25 mm

   Washers are available in stainless steel with gasket, low-cost steel types, and others, with outer diameters of 25 mm and 20 mm. Select based on roofing profile, the area to be pressed, the risk of rainwater infiltration, and dissimilar metal contact with the roofing material. Some products are supplied as the body only without a washer.

This guide was written by AI based on the listed products' documents and specification items.

About Screws and bolts and all products

Description

The double thread firmly holds new roofing material, and the S-cut tip allows easy penetration into hard sections. Sizes range from 6.3 × 75 mm to 6.3 × 120 mm.

FAQ

Q. What construction methods can the Covertec for Wood Substrate screw be used for?

A. It is used for the roof cover method on wood substrate.

Q. What are the size and washer outer diameter options for Covertec for Wood Substrate?

A. The nominal diameter is 6.3 mm and the nominal length ranges from 75 to 120 mm. Two washer outer diameters are available: 25 mm and 20 mm.

Q. How does Covertec for Wood Substrate hold roofing material and penetrate hard sections?

A. The double thread firmly holds new roofing material. The S-cut tip makes it easier to penetrate hard sections.

Q. What is the pull-out holding force of Covertec for Wood Substrate in wood substrate?

A. The pull-out holding force in wood substrate is 2.5 kN.

Written by AI based on the content of the source documents.

Source documents

• Catalog カバーテック 屋根改修システム用ねじ Roof Fastening System 2 pages
  Found on: https://www.jpf-net.co.jp/ebook.html